GPU-aware scaling: NVIDIA (nvidia-smi), AMD (sysfs VRAM), Apple Silicon (unified memory). GPU mode detected at install, persisted to settings. Scaling ceiling: (free_resource - existing_llm_usage) / 2 / per_instance_cost. VoiceInstanceManager spawns/stops sr-voice processes on unique ports. Battery detection scales to 1 worker. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>